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Prospect Heights, Illinois, is a compact city nestled within Cook County, a northwestern suburb of Chicago. Its geography is characteristic of the Chicago metropolitan area – a relatively flat landscape shaped by glacial activity during the last ice age. The terrain is gently rolling, with an elevation averaging around 784 feet above sea level. This flatness contributes to potential air stagnation, particularly during certain weather patterns. Prospect Heights is not directly on the shores of Lake Michigan, but benefits from the moderating influence of the lake’s proximity, approximately 15 miles east. The surrounding landscape is a mix of residential areas, light commercial development, and pockets of green space, including parks and golf courses. Historically, the area was largely agricultural, but has transitioned into a predominantly suburban environment. To the south and east lie denser urban areas of Chicago, representing a significant source of regional air pollution. The urban-rural gradient is noticeable, with air quality generally improving as one moves further away from the city center, though prevailing winds can quickly transport pollutants. The presence of O'Hare International Airport to the northwest also introduces localized emissions. Understanding these geographical factors is crucial for interpreting air quality trends in Prospect Heights.

Air quality in Prospect Heights follows a distinct seasonal pattern. Summer months (June-August) often see elevated ozone levels due to high temperatures and strong sunlight reacting with vehicle emissions and industrial byproducts from nearby Chicago. Stagnant air masses can exacerbate this, leading to hazy conditions. Fall (September-November) typically brings improved air quality as temperatures cool and sunlight decreases, though occasional wood smoke from residential heating can become a localized concern. Winter (December-February) sees the lowest overall pollution levels, but cold temperatures can trap pollutants near the ground, especially during temperature inversions. Snowfall can temporarily cleanse the air, but also contributes to road salt particulate matter. Spring (March-May) is a transitional period, with fluctuating temperatures and increased pollen counts, which can aggravate respiratory conditions. March and April often experience dust from agricultural activities in surrounding areas. For sensitive groups – children, the elderly, and those with respiratory illnesses – limiting strenuous outdoor activity during peak ozone days in summer and avoiding prolonged exposure on cold, stagnant winter days is advisable. Monitoring local forecasts and being aware of wind direction can help mitigate exposure.